Plano-Convex Lens ZnSe - Model #: LP-50.8-Z-1.5M-AR-BBAR(8-14) 50.8mmØ X 6.4mm E.T. EFL = 1.5 Meter (1500mm) 59.05” @ 8-14µm Coated: Special Coating for AR/AR @ 8-14µm